Danny Phantom

From the introduction:

Welcome to the world of Danny Phantom. Well, technically it is two worlds; the human world and the Ghost Zone. The history of these two worlds are simple; humans fear and hate ghosts and ghosts hate humans. But this isn’t like normal worlds at war. This is a Nickelodeon show, so the fights are down played.

You arrive one month after a young Danny Fenton gained his ghost powers (episode one). He still doesn’t have full control of them, but he is learning. What you do in your ten years is now up to you.